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Fair Value of Financial Investments and Liabilities - Income from Financial Investments Net, Included in Other, Net, Within Other Income (Expense), Net (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Schedule of Investments [Line Items] |  |
Total income from financial investments | $ 3 | $ 16
Private Equity Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Realized gains | $ 3 | $ 16

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- Definition Marketable securities realized gain. + References No definition available. + Details
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- Definition The aggregate amount of income from investments (for example, dividends) not considered a component of the entity's core operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 + Details
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- Details
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